[TowerTalk] tower grounding

Please don't use #6 for your radials. Too inductive and small for the
current. If you must use round members, #2 is the minimum recommended
although 2/0 would be the best. Even better than round members, would
be flat solid copper strap at least 1-1/2" wide.
73,
Bob Wanderer AA0CY
former Senior Applications Engineer at PolyPhaser Corp.
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From: Brian Harris[SMTP:Brian.Harris@sv.sc.philips.com]
Sent: Saturday, June 13, 1998 1:34 PM
To: towertalk@contesting.com
Subject: [TowerTalk] tower grounding
I have a few of questions. Here is my scenario:
I have Trylon 88' tower in 8.25 yards of concrete. There is a circular ring of
2-0 wire below ground around concrete base. The ring is cadwelded to six 8'
ground rods, two at each leg. To better dissipate a lightning hit I intend to
install twelve 40-70' radials made of #6 bare solid copper. The radials will be
attached to the ground rods with brass (or are they bronze?) compression clamps.
I intend to braze the clamp/rod/radial joints together. From each ground rod I
will run a piece of copper flashing to the tower legs, again, two per leg. I
know how to attach the flashing to the tower leg thanks to previous advice. I
intedn to merely fold the copper flashing so that it will fit in between either
the 2-0 wire or the ground rods and clamp it with one of the compression clamps
and then braze the joints.
Questions -
1. Is brazing recommended or is it better to silver solder? Note: It's too
late for cadwelding these joints.
2. Can brazing be done with propane torch or do I have to go retrieve my
oxy-acetylene rig that a friend borrowed?
3. How deep should I bury the #6 radials? Note: We have no heaving in North
Texas.
Thanks for your time.
73, Brian
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